Los Angeles, Nov 3 (IANS): Actor George Clooney is unlikely to marry again ever, says his sister Adelia Zeidler.

The actor, 51, was married to Talia Balsam from 1989 to 1993 and is now dating wrestler Stacy Keibler. But his older sibling Zeidler believes her brother will always be more committed to his career than his relationships.

"George will probably not get married. He decided that he could have the career or he could have a family," showbizspy.com quoted Zeidler as saying.

"He set goals for himself and worked hard to achieve those goals. He's very happy with his life," she added.

While Zeidler says Keibler, 33, is "very nice", she revealed Clooney rarely talks about her.

"He'll tell me little things that are going on but mostly we just gab about inconsequential matters," she said.

Recent reports claimed Clooney's friend Julia Roberts urged him not to dump Keibler.

Clooney got cold feet after he and Stacy celebrated their first anniversary as a couple, so Roberts rushed to the rescue.

"When Julia heard that George was about to end the relationship before it got too serious, she told him Stacy's a great girl, that he should latch on to her, and that he was too old to keep playing the field," said a source.

"She even told George he should marry Stacy and start a family. George agreed that although he and Stacy had a rough spot, they could still make it work… but he still wasn't promising anything about getting married," the source said.